Hydraulic Brake Lock Includes Adapter Fittings for 3/16 inch Brake Line Black Anodized Aluminum Uses hydraulic line pressure to temporarily hold brakes Unit must be mounted in a location that is easy to reach from the drivers seat while pressing on the brake pedal so that you can ...Hydraulic Brake Lock Includes Adapter Fittings for 3/16 inch Brake Line Black Anodized Aluminum Uses hydraulic line pressure to temporarily hold brakes Unit must be mounted in a location that is easy to reach from the drivers seat while pressing on the brake pedal so that you can set the lock Most commonly used on the rear brakes No special linkage required for simple installation Operation: to set lock - press on the brake pedal, push the knob down & release brake pedal. to release lock - step on the brake pedal slightly harder than before and it will release automatically g